Question

after repairing several water leaks in their house, the foster family noticed a 10% decrease in their monthly water bill. what decimal number represents the percent decreased in the foster family's water bill?

Answer 1

The decrease in the water bill is 10%.

By definition,
$10\% = \frac{10}{100} = \frac{1}{10} \times \frac{10}{10} = \frac{1}{10} =0.1$

Answer: 0.1